https://www.keppeler-te.de/pages/produkte-products/jagd-hunting/einstecklaeufe-insert-barrels.php

https://www.zapf-jagdwaffen.de/

Alright Ford, I have the full length(60cm) Keppler(Trademark stamped) insert(„von vorne verstellbar“) in hand. Looks like it was installed & Passed thru the München Proof Facility in 2001. And he has been making weapons since 1795. The Bueschenmacher of record looks to be M.(Moritz) Zapf of Trübenbach?? It looks just like the one above in the adjustment & installation section. Now does the donor scattergun tube need to be exactly 60cm??? Or can it be a little longer?

How exactly does one adjust the brass(whatever) collar on the threaded rear part of the insert?

Note, the insert does not appear to allow being inserted from the muzzle, and I suspect Choke. So, does the Choke have to be relieved in order to install?

Hochachtungsvoll,

Raimey
rse